sync code with last improvements from OpenBSD

xserver/hw/xwin/winmsgwindow.c

@@ -0,0 +1,183 @@
+/*
+ * Copyright (C) Jon TURNEY 2011
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifdef HAVE_XWIN_CONFIG_H
+#include <xwin-config.h>
+#endif
+
+#include "win.h"
+
+/*
+ * This is the messaging window, a hidden top-level window. We never do anything
+ * with it, but other programs may send messages to it.
+ */
+
+/*
+ * winMsgWindowProc - Window procedure for msg window
+ */
+
+static
+LRESULT CALLBACK
+winMsgWindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+#if CYGDEBUG
+    winDebugWin32Message("winMsgWindowProc", hwnd, message, wParam, lParam);
+#endif
+
+    switch (message) {
+    case WM_ENDSESSION:
+        if (!wParam)
+            return 0;           /* shutdown is being cancelled */
+
+        /*
+           Send a WM_GIVEUP message to the X server thread so it wakes up if
+           blocked in select(), performs GiveUp(), and then notices that GiveUp()
+           has set the DE_TERMINATE flag so exits the msg dispatch loop.
+         */
+        {
+            ScreenPtr pScreen = screenInfo.screens[0];
+
+            winScreenPriv(pScreen);
+            PostMessage(pScreenPriv->hwndScreen, WM_GIVEUP, 0, 0);
+        }
+
+        /*
+           This process will be terminated by the system almost immediately
+           after the last thread with a message queue returns from processing
+           WM_ENDSESSION, so we cannot rely on any code executing after this
+           message is processed and need to wait here until ddxGiveUp() is called
+           and releases the termination mutex to guarantee that the lock file and
+           unix domain sockets have been removed
+
+           ofc, Microsoft doesn't document this under WM_ENDSESSION, you are supposed
+           to read the source of CRSS to find out how it works :-)
+
+           http://blogs.msdn.com/b/michen/archive/2008/04/04/application-termination-when-user-logs-off.aspx
+         */
+        {
+            int iReturn = pthread_mutex_lock(&g_pmTerminating);
+
+            if (iReturn != 0) {
+                ErrorF("winMsgWindowProc - pthread_mutex_lock () failed: %d\n",
+                       iReturn);
+            }
+            winDebug
+                ("winMsgWindowProc - WM_ENDSESSION termination lock acquired\n");
+        }
+
+        return 0;
+    }
+
+    return DefWindowProc(hwnd, message, wParam, lParam);
+}
+
+static HWND
+winCreateMsgWindow(void)
+{
+    HWND hwndMsg;
+
+    // register window class
+    {
+        WNDCLASSEX wcx;
+
+        wcx.cbSize = sizeof(WNDCLASSEX);
+        wcx.style = CS_HREDRAW | CS_VREDRAW;
+        wcx.lpfnWndProc = winMsgWindowProc;
+        wcx.cbClsExtra = 0;
+        wcx.cbWndExtra = 0;
+        wcx.hInstance = g_hInstance;
+        wcx.hIcon = NULL;
+        wcx.hCursor = 0;
+        wcx.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
+        wcx.lpszMenuName = NULL;
+        wcx.lpszClassName = WINDOW_CLASS_X_MSG;
+        wcx.hIconSm = NULL;
+        RegisterClassEx(&wcx);
+    }
+
+    // Create the msg window.
+    hwndMsg = CreateWindowEx(0, // no extended styles
+                             WINDOW_CLASS_X_MSG,        // class name
+                             "XWin Msg Window", // window name
+                             WS_OVERLAPPEDWINDOW,       // overlapped window
+                             CW_USEDEFAULT,     // default horizontal position
+                             CW_USEDEFAULT,     // default vertical position
+                             CW_USEDEFAULT,     // default width
+                             CW_USEDEFAULT,     // default height
+                             (HWND) NULL,       // no parent or owner window
+                             (HMENU) NULL,      // class menu used
+                             GetModuleHandle(NULL),     // instance handle
+                             NULL);     // no window creation data
+
+    if (!hwndMsg) {
+        ErrorF("winCreateMsgWindow - Create msg window failed\n");
+        return NULL;
+    }
+
+    winDebug("winCreateMsgWindow - Created msg window hwnd 0x%p\n", hwndMsg);
+
+    return hwndMsg;
+}
+
+static void *
+winMsgWindowThreadProc(void *arg)
+{
+    HWND hwndMsg;
+
+    winDebug("winMsgWindowThreadProc - Hello\n");
+
+    hwndMsg = winCreateMsgWindow();
+    if (hwndMsg) {
+        MSG msg;
+
+        /* Pump the msg window message queue */
+        while (GetMessage(&msg, hwndMsg, 0, 0) > 0) {
+#if CYGDEBUG
+            winDebugWin32Message("winMsgWindowThread", msg.hwnd, msg.message,
+                                 msg.wParam, msg.lParam);
+#endif
+            DispatchMessage(&msg);
+        }
+    }
+
+    winDebug("winMsgWindowThreadProc - Exit\n");
+
+    return NULL;
+}
+
+Bool
+winCreateMsgWindowThread(void)
+{
+    pthread_t ptMsgWindowThreadProc;
+
+    /* Spawn a thread for the msg window  */
+    if (pthread_create(&ptMsgWindowThreadProc,
+                       NULL, winMsgWindowThreadProc, NULL)) {
+        /* Bail if thread creation failed */
+        ErrorF("winCreateMsgWindow - pthread_create failed.\n");
+        return FALSE;
+    }
+
+    return TRUE;
+}